Title:
Dictation type mask with combined switch and air control
United States Patent 2882355


Inventors:
Webb, Horace L.
Application Number:
US39938353A
Publication Date:
04/14/1959
Filing Date:
12/21/1953
Assignee:
Webb, Horace L.
Primary Class:
Other Classes:
181/21, 283/2, 381/354
International Classes:
H04R1/08
View Patent Images:
US Patent References:
2572547Dictation mask with cartridge type silencer1951-10-23
1678842Microphone1928-07-31
1508310Telephone mouthpiece1924-09-09